克里格方法在村鎮(zhèn)地表水體水質(zhì)監(jiān)測與模擬中的應(yīng)用研究
[Abstract]:At present, the pollution of surface water in villages and towns in China is becoming more and more serious, and more attention has been paid to monitoring the water quality of surface water bodies in villages and towns. However, the development of surface water quality monitoring system in villages and towns in China is still not perfect. The results of monitoring and analysis often have shortcomings such as one-sided water quality information, single disorderly expression mode, unclear spatial distribution of pollutants, and so on. In this paper, taking Qiakou Town, Changsha City, Hunan Province as a pilot study, with the help of geostatistics theory and a variety of professional software, the characteristics of surface water quality pollution and the spatial distribution of surface water in Qiakou Town are studied. It provides a new angle and reference for monitoring and simulation of surface water quality in villages and towns in China. The main contents of this paper are as follows: (1) the whole water quality of surface water in Qiaokou town is evaluated by using index evaluation method. The evaluation results show that the overall water quality of surface water body in Qiakou Town is not optimistic. The proportion of water quality status grade in the sampling sites is 50.57, and the eutrophication trend of most water bodies is obvious. It is urgent to monitor and control. (2) to carry out global and local autocorrelation analysis on the average Nemero index of surface water bodies in various formed villages in Qiokou town. The results showed that the distribution of surface water pollutants in Qiaokou town was positively correlated (Moran'I=0.2985) to some extent, and the pollution degree of Qiaokou community and its surrounding areas was high and high, and the surrounding area of Lantang Temple village was lower. (3) using common Kriging OK, with dissolved oxygen as the auxiliary variable, and using UV_ (254) as the auxiliary variable, the co-Kriging CK-UV_ (254). Five interpolation methods such as regression Kriging UK and Kriging BP-OK combined with BP neural network were used to predict the spatial distribution of COD_ (Cr) concentration of chemical oxygen demand (COD_ (Cr) in Xinhe River, a landscape water body in the northern part of Qiaokou community. The results show that the predicted results of the five interpolation methods accord with the field survey of the distribution of pollution sources, and reflect the spatial distribution of COD_ (Cr) concentration in the water better. The interpolation accuracy is the best with UV_ (254) as the auxiliary variable, and with the decrease of the number of interpolation points, the accuracy of various interpolation methods is decreasing as a whole.
【學(xué)位授予單位】:湖南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:X832;X52
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